1) A group of boys were playing basketball at their school courtyard when one of the boys, Tan Wei Mun, fell and broke his arm during the game.
2) Earlier that day, there was an altercation between some boys at the library over seating and borrowing a book, which led to pushing and a punch being thrown that caused one boy to fall into a pond.
3) During the basketball game, several boys fell to the ground while trying to grab a rebounding ball, and Tan Wei Mun was unfortunately at the bottom of the pile and injured his arm.